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在旋流沉砂池砂石废水处理中,具有复杂流态的高浓度固液两相流问题一直是难以攻克的难题,给工程设计与运行带来很大困难。该文采用分子动理学方法从固液两相流相互作用的微观特性出发,得出合理描述旋流沉砂池内高浓度下颗粒间碰撞项的Eulerian-Eulerian两相流模型。采用滑移网格技术实现了旋流沉砂池桨叶转动区域的模拟。结合西南某水电工程砂石废水处理中的旋流沉砂池流场进行了模拟,并讨论了搅拌桨转速、桨叶位置、叶片数量和叶片角度对旋流沉砂池内水相、颗粒相的影响。结果表明:该水电站砂石处理系统旋流沉砂池的最佳桨叶结构和运行工况为:桨叶转速r=105rap/min,桨叶位置z=592mm,叶片数量为4片,叶片角度为45°。
In the treatment of swirling grit chamber gravel wastewater, the problem of high concentration solid-liquid two-phase flow with complicated flow regime has been a difficult problem to overcome, which brings great difficulties to engineering design and operation. In this paper, the molecular dynamics method is used to study the Eulerian-Eulerian two-phase flow model which can reasonably describe the collision between particles in a high concentration of cyclone grit chamber from the microscopic characteristics of the interaction between solid and liquid phases. The sliding grid technique is used to simulate the rotating area of the vortex grit chamber. Combined with the flow field of swirling grit chamber in a hydropower project in Southwest China, the flow field of swirling grit chamber in a hydropower project was simulated. The effects of propeller rotation speed, blade position, blade number and blade angle on water phase and particle phase in the cyclone grit chamber influences. The results show that the optimal blade structure and operating conditions of the cyclone grit chamber of the sandstone processing system of this hydropower station are as follows: paddle speed r = 105rap / min, paddle position z = 592mm, number of blades 4, blade angle Is 45 °.